Graphical user interface for a display screen or portion thereof



FIG. 1 is a front view of a graphical user interface for a display screen or portion thereof showing our new design;

FIG. 2 is a front view of a second embodiment thereof;

FIG. 3 is a front view of a third embodiment thereof;

FIG. 4 is a front view of a fourth embodiment thereof; and,

FIG. 5 is a front view of a fifth embodiment thereof.

The broken line showing of the display screen or portion thereof on all views is not part of the claimed design.

The AT&T trademark in the upper left corner of the Figures is the property of AT&T Intellectual Property II, L.P. Trademarks are the property of their respective owners. 

The ornamental design for a graphical user interface for a display screen or portion thereof, substantially as shown and described. 